This for sure the same class of problem and there is quiet some “noise” around the general handling of ‘hidden’ directories and files in the forums.
I filed this as a bug because the ‘.attachments’ is accepted without complaining but it doesn’t work. It requires further investigation to learn that dot-directories, which are obviously NOT hidden directories on windows, arn’t processed.
I would expect that if I state a directory explictely it is either rejected as invalid or used.